Jared Padalecki, 19
YOU KNOW HIM AS Dean, Rory's floppy-haired boyfriend on Gilmore GirlsWHERE YOU'VE SEEN HIM BEFORE Silent Witness, ER
WHY WE THINK HE'S GREAT Padalecki brings a gentility to his role as an introspective teenager in love, and keeps pace with the sharply written dialogue that's become the show's signature style.